In between I found the time to setup an env. build upon older releases: $ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 18.04.1 LTS Release: 18.04 Codename: bionic $ dpkg -l | grep -i qemu ii qemu-block-extra:s390x 1:2.11+dfsg-1ubuntu7 s390x extra block backend modules for qemu-system and qemu-utils ii qemu-kvm 1:2.11+dfsg-1ubuntu7 s390x QEMU Full virtualization on x86 hardware ii qemu-system-common 1:2.11+dfsg-1ubuntu7 s390x QEMU full system emulation binaries (common files) ii qemu-system-s390x 1:2.11+dfsg-1ubuntu7 s390x QEMU full system emulation binaries (s390x) ii qemu-utils 1:2.11+dfsg-1ubuntu7 s390x QEMU utilities $ apt-cache policy maas maas: Installed: 2.6.0-7803-g6fc5f26eb-0ubuntu1~18.04.1 Candidate: 2.6.0-7803-g6fc5f26eb-0ubuntu1~18.04.1 Version table: *** 2.6.0-7803-g6fc5f26eb-0ubuntu1~18.04.1 500 500 http://ppa.launchpad.net/maas-maintainers/testing/ubuntu bionic/main s390x Packages 100 /var/lib/dpkg/status 2.4.2-7034-g2f5deb8b8-0ubuntu1 500 500 http://us.ports.ubuntu.com/ubuntu-ports bionic-updates/main s390x Packages 500 http://ports.ubuntu.com/ubuntu-ports bionic-updates/main s390x Packages 500 http://aus.ports.ubuntu.com/ubuntu-ports bionic-updates/main s390x Packages 2.4.0~beta2-6865-gec43e47e6-0ubuntu1 500 500 http://us.ports.ubuntu.com/ubuntu-ports bionic/main s390x Packages 500 http://ports.ubuntu.com/ubuntu-ports bionic/main s390x Packages In this environment MAAS is not able to Commission ("Failed commissioning"). Trying to start the vm manually with virsh ends up with: $ virsh start vm1 --console Domain vm1 started Connected to domain vm1 Escape character is ^] done Using IPv4 address: 192.168.122.102 Requesting file "boots390x.bin" via TFTP from 192.168.122.1 Receiving data: 0 KBytesfile not found: boots390x.bin Failed to load OS from network So that is expecting, since the qemu packages version 1:2.11+dfsg-1ubuntu7 were initially used - the GA version, that's not known to work - the needed patch came later. The first qemu packages that should be good are the ones with version 1:2.11+dfsg-1ubuntu7.7. But (after discussing with cpaelzer) the qemu packages didn't really changed since 1:2.11+dfsg-1ubuntu7.7, I thought that I now upgrade to the latest ones (1:2.11+dfsg-1ubuntu7.22): $ sudo apt install qemu-block-extra qemu-kvm qemu-system-common qemu-system-s390x qemu-utils Reading package lists... Done Building dependency tree Reading state information... Done Suggested packages: debootstrap Recommended packages: sharutils The following packages will be upgraded: qemu-block-extra qemu-kvm qemu-system-common qemu-system-s390x qemu-utils 5 upgraded, 0 newly installed, 0 to remove and 167 not upgraded. Need to get 3,249 kB of archives. After this operation, 32.8 kB of additional disk space will be used. Get:1 http://us.ports.ubuntu.com/ubuntu-ports bionic-proposed/main s390x qemu-utils s390x 1:2.11+dfsg-1ubuntu7.22 [811 kB] Get:2 http://us.ports.ubuntu.com/ubuntu-ports bionic-proposed/main s390x qemu-system-common s390x 1:2.11+dfsg-1ubuntu7.22 [671 kB] Get:3 http://us.ports.ubuntu.com/ubuntu-ports bionic-proposed/main s390x qemu-block-extra s390x 1:2.11+dfsg-1ubuntu7.22 [37.3 kB] Get:4 http://us.ports.ubuntu.com/ubuntu-ports bionic-proposed/main s390x qemu-kvm s390x 1:2.11+dfsg-1ubuntu7.22 [12.5 kB] Get:5 http://us.ports.ubuntu.com/ubuntu-ports bionic-proposed/main s390x qemu-system-s390x s390x 1:2.11+dfsg-1ubuntu7.22 [1,717 kB] Fetched 3,249 kB in 0s (8,360 kB/s) (Reading database ... 67530 files and directories currently installed.) Preparing to unpack .../qemu-utils_1%3a2.11+dfsg-1ubuntu7.22_s390x.deb ... Unpacking qemu-utils (1:2.11+dfsg-1ubuntu7.22) over (1:2.11+dfsg-1ubuntu7) ... Preparing to unpack .../qemu-system-common_1%3a2.11+dfsg-1ubuntu7.22_s390x.deb . .. Unpacking qemu-system-common (1:2.11+dfsg-1ubuntu7.22) over (1:2.11+dfsg-1ubuntu 7) ... Preparing to unpack .../qemu-block-extra_1%3a2.11+dfsg-1ubuntu7.22_s390x.deb ... Unpacking qemu-block-extra:s390x (1:2.11+dfsg-1ubuntu7.22) over (1:2.11+dfsg-1ub untu7) ... Preparing to unpack .../qemu-kvm_1%3a2.11+dfsg-1ubuntu7.22_s390x.deb ... Unpacking qemu-kvm (1:2.11+dfsg-1ubuntu7.22) over (1:2.11+dfsg-1ubuntu7) ... Preparing to unpack .../qemu-system-s390x_1%3a2.11+dfsg-1ubuntu7.22_s390x.deb .. . Unpacking qemu-system-s390x (1:2.11+dfsg-1ubuntu7.22) over (1:2.11+dfsg-1ubuntu7 ) ... Setting up qemu-block-extra:s390x (1:2.11+dfsg-1ubuntu7.22) ... Setting up qemu-utils (1:2.11+dfsg-1ubuntu7.22) ... Processing triggers for man-db (2.8.3-2) ... Setting up qemu-system-common (1:2.11+dfsg-1ubuntu7.22) ... Setting up qemu-system-s390x (1:2.11+dfsg-1ubuntu7.22) ... Setting up qemu-kvm (1:2.11+dfsg-1ubuntu7.22) ... And with that the Commissioning worked and ended correctly, and I was also able to complete a Deployment afterwards. I deployed 19.04 (disco, since I think that Sean faced the issue while he tried to deploy disco, too) and it worked. The system (vm1) came up and I was able to login: $ ssh ubuntu@192.168.122.201 The authenticity of host '192.168.122.201 (192.168.122.201)' can't be established. ECDSA key fingerprint is SHA256:WMeXfn4hIAc38WUnXqPuhASMLjiig+uzdhqfkjzR7mI. Are you sure you want to continue connecting (yes/no)? yes Warning: Permanently added '192.168.122.201' (ECDSA) to the list of known hosts. Welcome to Ubuntu 19.04 (GNU/Linux 5.0.0-38-generic s390x) * Documentation: https://help.ubuntu.com * Management: https://landscape.canonical.com * Support: https://ubuntu.com/advantage System information as of Mon Feb 10 10:44:33 UTC 2020 System load: 0.19 Processes: 95 Usage of /: 42.4% of 7.27GB Users logged in: 0 Memory usage: 15% IP address for enc1: 192.168.122.201 Swap usage: 0% 4 updates can be installed immediately. 4 of these updates are security updates. The programs included with the Ubuntu system are free software; the exact distribution terms for each program are described in the individual files in /usr/share/doc/*/copyright. Ubuntu comes with ABSOLUTELY NO WARRANTY, to the extent permitted by applicable law. To run a command as administrator (user "root"), use "sudo ". See "man sudo_root" for details. ubuntu@vm1:~$